i would use the WM8804 to convert the S/PDIF to I2S (16bit). The I2S should feed my TDA1541A NOS DAC.

Unfortunately i have no sound output :( , independent if i set the I2S to 16 or 24 bit (AIFCONF0 1 or 0).

Malka07 use the same DAC pcb´s from me and have also no luck.

The connections are as follows:

LRCLK to TDA Pin1
BCK to TDA Pin2/4
Data to TDA Pin3.

Can someone help?

With my Teradak X2 USB to I2S converter, everything works fine!

Best regards,
Oliver

Koen Smeets

27th November 2010 12:14 PM

Is there any output on the pins of the WM8804? Check for a LRCLK (pin15) at least.

Also, note that the datasheet has an example for 16-bit right-justified audio, not I2S. This bit me once trying to use a WM8805...

I don't know the twisted pear board sufficiently well to be of any other advice.

Good luck!

vanwykca

27th November 2010 05:29 PM

Hi Oliver,

I've checked my setup(TP 8804 into TDA1541a NOS) and had a look at the TDA data sheet and it looks like pin27(OB/TWC) on the TDA has to be pulled high(connected to pin28/VDD/+5v) to allow it to accept multiplexed two's complement/I2S input. Might be worth checking in your setup.

Can you please confirm there is at least LRCK signal? (if you have oscilloscope, that is). If you don't have oscilloscope, simply measure DC from LRCK to GND and report back. Measure DC with and without music playing.

Also, what are the status LEDs saying? All off?

Last thing which comes to mind: is the DAC powered from the same supply? If not, you might need to also connect the GNDs of the 2 boards?

Malka07

28th November 2010 11:24 PM

Quote:

Originally Posted by Koen Smeets
(http://www.diyaudio.com/forums/showthread.php?p=2380190#post2380190)

Can you please confirm there is at least LRCK signal? (if you have oscilloscope, that is). If you don't have oscilloscope, simply measure DC from LRCK to GND and report back. Measure DC with and without music playing.

Also, what are the status LEDs saying? All off?

Last thing which comes to mind: is the DAC powered from the same supply? If not, you might need to also connect the GNDs of the 2 boards?

Hi and thanks for your help.

I have the same dac as Oliver(Dvb-projekt) and am also having the same problem. I dont have an oscilloscope, but i measured dc from LRCK to GND with and without music playing and both times i got 1.64v.

All LEDs are green when a coax cable in connected to the dac regardless of if music is playing or not. If the coax is disconnected then all lights are red except non audio which remains green.

I have Gnd on my Twisted Pair board connected to Gnd on the dac board.

Pictures of the dac can be seen in this thread along with Board layouts etc...maybe that will help too.